These grand regulation guides include five separate measurements for regulation specifications including:
 
Blow distance: 43mm-48mm
Set off/let off: 2mm-7mm
Damper lift: 21.5mm-24mm can also be used to help judge checking,
Key height: 62mm-67mm.
 
The guides are designed in a stable thermoplastic polymer made strictly from renewable resources generated from biodegradable materials like cornstarch, which is softer than copper so as not to damage bass strings when in contact but a climatically stable material unlike wood, staying accurate but still flexible. They are more stable than wood and made in an ivory color to enable easy reading when in the action. Individually marked for ease of use and supplied in a purpose-made compact and protective case.